* Chart and verification below. If readers know of any inaccuracies, please contact me to verify the data. Thank you :)
Short Version: Tony Tan is related to Lee Hsien Loong.
1. Tony Tan’s father is Tan Seng Hwee.
Tony Tan, Family | Source: NLB
2. According to Geni, Tan Seng Hwee’s half-brother is Tan Chin Tuan.
In this newspaper article, Tan Chin Tuan is referred to as the “adopted son” of Tan Seng Hwee’s mother. A reader says “half-sibling” is correct since Tan Chin Tuan and Tan Seng Hwee had the same father (different mother). | Source: NLB (25 Nov 1934)
3. Tan Chin Tuan (Tony Tan’s uncle) was married to Helen Wee, who is the sister of Wee Yew Neo. (Sources: Geni, NLB, Veritas and Rojak Librarian).
Tan Chin Tuan (Mrs. LKY’s uncle-in-law) and Kwa Siew Tee (Mrs. LKY’s father) = sons-in-law of Wee Theam Seng. Source: Veritas and NLB (4 Feb 1946)
Wife of Tan Chin Tuan = “Helen.” Source: NLB (10 June 1954)
4. Kwa Siew Tee married Wee Yew Neo in 1910. They are the parents of Kwa Geok Choo (Mrs. LKY).
5. Tony Tan’s mother is Jessie Lim Neo Swee (refer to screenshot on Point #1).
6. Jessie Lim is the sister of Lim Geok Neo, who is the wife of Seet Cheng Kang.
Lim Geok Neo is the only portion in the family tree where I could not verify the information from more than one reliable source. However, the Geni profile for Lim Geok Neo was added by a family member (private profile), and is currently being managed by a fellow family member (Jimmy Seet).
Lim Geok Neo was the wife of Seet Cheng Kang. Profile was added by a Seet, and is currently managed by Jimmy Seet (son of Seet Cheng Kang). Source: Geni.
Jimmy Seet, son of Seet Cheng Kang. Source: Geni
7. Seet Cheng Kang’s second wife was Chua Swee Neo, who is the sister of Chua Jim Neo, who is the mother of Lee Kuan Yew.
8. This means that Tony Tan is related to Lee Hsien Loong through the family members of both Mr. and Mrs. Lee Kuan Yew.